TYPE: SOP State
TITLE: Render SOP Scene

The Render operation allows you to visualize the rendered scene in a portion of
the viewport in real time.

Choose a valid output driver from the menu immediately above the viewport or use
the default mantra renderer, then box-select the area of the screen you want
rendered.

The rendered image will update automatically as you make changes to the scene
elements or to the viewing position. You can also force a new rendering by
clicking the "Re-Render" button above the viewport.

Turning transparency on will composite the rendered image so that fully
transparent areas will show the viewport behind.

When rendering scenes with heavy geometry, it is possible to optimize the IFD's
so that minimal information is re-rendered.  This can speed up interactivity.
However, if:

~c(
    a)  Shaders are applied using Shader SOPs
    b)  Geometry is deforming (animated SOPs)
~c)

then turning off fast IFD generation is suggested.

The default renderer will not render with motion blur or depth of field.  To
render with these effects, please choose an output driver which has the
requisite options specified.

No shadow/reflection maps will be auto-generated by the render state.  All maps
must be pre-rendered for correct shading to occur.

NOTE:  Changes to geometry are not automatically detected (including changes to
indirect SHOP references), when geometry changes, it may be necessary to hit the
"Re-Render" button.
